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plotutils (or The GNU Plotting Utilities) are a set of programs and functions for drawing and data plotting. They include graph, a program for plotting two-dimensional scientific data. The programs are built on top of GNU libplot, a library for device-independent two-dimensional vector graphics. graph can display a graph under X-Windows and produce output in several file formats. These include idraw-editable Postscript, output that may be edited with Xfig, output in HP-GL/2 format for HP printers, output for Tektronix terminals, and output in the GNU graphics metafile format.

Accompanying graph is a `plot filter' called plot. It translates device-independent GNU graphics metafiles (produced for example by graph) into any of the other output formats.

Among the other programs, spline does spline interpolation of data. It normally uses either cubic spline interpolation or exponential splines in tension. Like graph, it can function as a real-time filter under some circumstances. ode provides the ability to integrate an ordinary differential equation, or a system of ordinary differential equations, when provided with an explicit expression for each equation. It supplements the plotting program gnuplot, which can plot functions but not integrate ordinary differential equations.

Distributed as a part of this package is GNU libplot, the underlying function library for device-independent two-dimensional vector graphics. It supports all the above output formats. It can draw such objects as lines, open and closed polylines, arcs, circles and ellipses, points, and markers. The filling of objects other than points and markers is supported (fill color, as well as pen color, may be set arbitrarily). Text strings may be drawn in any of 16 Hershey fonts, 35 Postscript fonts, and 45 PCL fonts. Cyrillic and Japanese Hershey fonts are included.

Current Version:   2.3

License Type:   GPL

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Source Code Availability: Yes

Available Binary Packages:

Targeted Platforms:

SGI, HP-UX, IBM, Sun, compiles and works fine on Linux without change of source code.

Software/Hardware Requirements:

C compiler, X11 libraries (needed for X11 screen output)

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